Every year lots of trees _______ to make our country more beautiful.

A．is planted

B．was planted

C．are planted

D．were planted

病历摘要：骨巨细胞瘤患者男，26岁，右尺骨远端隐痛。查体：右尺骨远端压痛，压之略有乒乓球感，皮肤无明显红肿，无明显软组织肿块。行右尺桡骨正侧位片检查。

2.诊断依据是什么？